Q.

12 W/m K Thermal diffusivity = 5.16 * 10 -7 m2/s

A. 43.07 hours
B. 53.07 hours
C. 63.07 hours
D. 73.07 hours
Answer» A. 43.07 hours
Explanation: t – t a/t 0 – t a = 0.86. also, α t/l 2 = 0.32.
532
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